  <button [fuiPopover]="tooltip" fuiBtn="success">
    Content
  </button>
  <fui-popover #tooltip placement="top" trigger="click">
  <div class="popover">
    <div class="popover-title">
      标题
    </div>
    <div class="popover-content">
      内容 <br>
      内容
    </div>
  </div>
</fui-popover>
